Create an ultra-realistic image of a stunning mermaid swimming gracefully underwater. She has long, flowing hair that cascades like waves, shimmering with shades of aquamarine and sea green. Her captivating eyes are large and mesmerizing, reflecting the colors of the ocean and drawing viewers in with their depth. The mermaid's tail is adorned with intricate scales that glisten in the light, showcasing vibrant hues of blue and silver. Surround her with a vibrant underwater landscape filled with colorful coral reefs, schools of fish, and ethereal sea plants swaying gently in the current. Sunlight filters through the water, creating a magical atmosphere around her. The scene should evoke a sense of wonder and beauty, capturing the enchanting essence of the mermaid's world.